Yes, it's done at XS. XS is where many world winning overclockers hang out. The test is a few of the top pastes, Vapor did the test mainly to test the new metal T material and tossed in comparisons of other TOP pastes users at XS use. No need to check all of them. Only some are worth the trouble to look at.
So thats why the list is so short. There is one around where they used toothpaste even, think it was 30+ pastes, and that is over 2 years old. Those kinds of comparisons don't help much.
Here is a test of a new paste, look at all the tests of the other pastes in the user tests. Might help.http://www.overclockers.com/forums/showthread.php?t=632321